Improvement in punching-machines



" 1W. KRUTZSGH. Il lPunching-Mamchine.

'f' No; 206,026. Patented Jun/16, |878.

" UNITED STATE-s PATENT OFFICE,

WILLIAM KRUTZSCH, OF DAYTON, OHIO, ASSIGNOR TO GEORGE R. HOGLEN ANDFRANK M. HOGLEN, OF SAME PLACE.

IMPROVEMENT IN PUNCHING-MACHINES.

Specification forming part of Letters Patent No. 206,026, dated July 15,1878; application filed April 23, 1878.

To all whom tt may concern:

Be it known that I, WILLIAM Knnrzscn, of Dayton, in the county ofMontgomery and State of Ohio, have invented certain new and usefulImprovements in Hand. and Power Punching-Machines; and I do herebydeclare that the following is a full, clear, and exact descriptionthereof, which will enable others skilled in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings, and to the letters of reference marked thereon,which form a part of this specification.

This invention relates to that class of punching machines or presseswhich are operated by hand, but may be adapted to be operated by steamor other power; and its object is simplicity and cheapness, to be easilyoperated, to be made less liable to get out of repair than the ordinarymachine, and to overcome many objections to which the old ones aresubject; and it consists in so uniting the bearing parts of the machinethat the strain incident to the pressure of the punch going through theiron or metal is directly transferred between the head of the frame andthe iron to be punched.

It also consists in the construction of the frame and the arrangement ofthe cams with their operating mechanism, as will hereinafter more fullyappear.

In many of the old methods the levers work on trunnions or pins runningthrough the sides of the frame and the cam ends of the levers. Thesepins often give way, and the holes in the cam-heads soon become oblong,then loose, and nally give way altogether, when the machine becomes outof order, by which much valuable time and labor are lost. Again, the'said pins cannot withstand the great pressure to which punching-pressesare sometimes subjected-say, when punching steel and other very hard andsolid material.

Referring to the drawings, Figure l represents a side elevation, showing the punch up and the levers open. In this position it is evident thatthe bearings of all the parts are in a direct line from the point of thepunch to the bearing in the die in the head of the frame and l willparticularly point out the great advantage of this position.

It is obvious that the greatest pressure is at the time when the punchcommences to go through the metal, for then the metal is thicker than atany other portion of the stroke of the punch, and therefore requiresgreater pressure; and just at this point the levers or cams have theirgreatest power, for the reason that they are nearer their fulcrums thenthan at any other time, and therefore less strain, and accordingly lessliable to give way under the pressure, the whole or nearly the wholepressure being transferred to the head or upper bearing, requiring onlya small pin to keep them in position.

Fig. 2 shows a vertical longitudinal section through the center of themachine. In this ligure the punch is shown down. As will be seen, theline of pressure would be to one side of the vertical line through thepunch, and consequently the same pressure could not be exerted as if ona direct line, in proportion to the size of the machine 5 but thisvariance of line is necessary for the relief of the punch from the iron,so as to withdraw it for its next stroke.

It may be remarked that the right and left hand screws and ball orswivel joints are nearly ofthe ordinary construction, some differencebeing in the swivel-joint E, as shown in detail in Fig. 3.

The frame A is shown as made of one piece; but it may be made in one ormore pieces, as preferred. It will also be seen that the frame isprovided with an elongated recess, in which the cam-heads work. In theupper end of this recess is secured a die or liner, L, curved out toconform to the upward-projecting cam-head d. This die is made of steel,or any hard substance, or chilled iron. The whole pressure of the punchcomes in contact with this die L, and when worn it is capable of beingreplaced.

The punch bar or plunger is provided 0n its upper end with a cam-shapedhead, b, and on each side of this head is arabbet or slot, e, for thepurpose of receiving a forked lever, c, by which the punch-plunger iswithdrawn. This fork c is loose in the rabbet, so that it does notinterfere when the plunger is going down, and only acts when raising theplunger.

There is an upper rounded projection on lever C, which works into acorresponding recess in the main canrlever B, and through thisprojection runs a pin, 1', and also through the sides of the frame A.The ofee of this pin is to keep the main levers and forked lever inplace.

The lever C is provided at its outer end with an adjusting-screw, bywhich more or less draw is given to the punch-plunger. Upon the outer orback end of levers B and l) are provided recesses j, in which balljointsare formed. Into these recesses are put swivels E, and through whichright and left hand screws operate for the working of the punch. Holesrun both ways through the bosses at the end of the cam-levers B and I),both of which are oval in shape, allowing easy motion for theswivel-bearings and for the screws.

A bracket, K, is provided for the reception ofthe lower end of the rightand left hand screw. The end of the bracket is provided with an openfork, so that when the pin i is withdrawn the levers B, D, and C may allbe removed together. This bracket K is secured to the body of the punchA.

Thus it will be seen that a very simple, easily-worked andeasily-constructed machine is provided.

The punch is secured in the ordinary Wav, and a lower die, upon whichthe iron to be punched rests, is also secured by any wellknown method.

It is evident that when the extremities of the arms recede the punch iswithdrawn from the iron, and when they are closing together they arethen pressing down upon the substance to be punched.

The lever and cam movement maybe applied to shearing and cuttingmachines.

I am aware that cam-levers operated by right and left hand screws havebeen heretofore in use; but their construction is not like mine, and Itherefore do not claim such; but

What I do claim, and desire to secure b v Letters Patent, is-

1. The combination, in apunching-nmchine, of the frame A, provided withbracket K, camlevers B and I), the punch-plunger b, and the die L,having a smooth working-surface, all constructed and operating as hereinset forth.

2. The combination of the frame A and levers B,D,and C with theswiveljoints j and E and the bracket K and operating-screw constructedand arranged as specified.

In testimony that I claim the foregoing as my own I atlix my si gnaturein presence ot' two witnesses.

WILLIAM KRUTZSCH.

\\'it|iesses:

JOHN A. SHAI'OK, (ino. W. HoGLEN.

